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The hash or "#" is usually just referenced by the browser, not the server, so Google does no care about the use of a "#" at the end of your URL. In fact, you can go to pretty much any page and add "#" at the end and you will get the same page, because it is a browser reference.

Some web designers will also just put "#" as the URL as they are coding, because they do not know the final URL.

If you can pinpoint where this is happening, I would suggest fixing it, even if it is not impacting Google indexing or your SEO... just from a "good house keeping" point of view.

You would use the canonical tag if you wanted to keep both versions in place. If you only want to keep one version, you would 301 redirect, which come to think of it... I don't know if you can do, again because the hash is usually just reference by the browser and not the server.

Here is also a quick quote from John Mu (an engineer at Google), stating, "We generally ignore the "fragments" (as inhttp://domain.com/path#fragment) when crawling, indexing and ranking since this is generally just something that is handled on the client side."

the hash "#" is sometimes used as a link reference to a specific spot on a linked page

i.e. www.companyname.com/category.index.php#specificspot

do you have access to google webmaster tools? in there, you should see a section about duplicate content that google is seeing. that might be of some help to you.

if by chance the # is not used in the way mentioned above, and it's some weird content management system character to manage pages, you may want to implement canonical tagging so that when someone views

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